Deleting rows.

Question

I have a CORD_LOB_MAPPING table which has a line_of_business as a column
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D2>DESC CORD_LOB_MAPPING
Name Null? Type
LINE_OF_BUSINESS NOT NULL VARCHAR2(10)
LOB_DESCRIPTION VARCHAR2(100)
LOB_SID NOT NULL VARCHAR2(10)
D2>SELECT LINE_OF_BUSINESS FROM CORD_LOB_MAPPING;
LINE_OF_BU
OPNRCH
OPNWLD
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I have the following 3 tables:
I want to delete rows from all the 3 tables depending on the follwoing rule.
In all the 3 tables i want to retain those rows whose data is present in CORD_LOB_MAPPING's line_of_business column
All those rows which do not corrospond to the line_of_business in CORD_LOB_MAPPING should be deleted.
For example, in the example given below, i am deleteing all rows from TMP_CORD_OUCS whose line_of_business
does not match with CORD_LOB_MAPPING line_of_business.
In other words, delete all rows which do not belong to OPNRCH and OPNWLD
DELETE FROM TMP_CORD_OUCS TCO
WHERE NOT EXISTS ( SELECT 1 FROM CORD_LOB_MAPPING CLM
WHERE UPPER(TCO.LINE_OF_BUSINESS) = UPPER(CLM.LINE_OF_BUSINESS));
D2>DESC tmp_cord_oucs
Name Null? Type
OUC_CODE VARCHAR2(9)
LATEST_PERIOD NUMBER(10)
OUC_PROCESS_FLAG VARCHAR2(1)
LINE_OF_BUSINESS VARCHAR2(10)
I want to know the delete statement for this table?
Delete all those rows from tmp_cord_rate_ids whose line_of_business is anything except OPNRCH and OPNWLD
DELETE FROM TMP_CORD_RATE_IDS TCRI
WHERE NOT EXISTS (SELECT 1
          FROM TMP_CORD_OUCS TCO, CORD_LOB_MAPPING CLM
          WHERE TCO.LINE_OF_BUSINESS=CLM.LINE_OF_BUSINESS
          AND TCRI.OUC_CODE=TCO.OUC_CODE)
D2>DESC tmp_cord_rate_ids
Name Null? Type
OUC_CODE VARCHAR2(9)
RATE_ID VARCHAR2(5)
RATEID_PROCESS_FLAG VARCHAR2(1)
I want to know the delete statement for this table?
Delete all those rows from tmp_cord_rates whose line_of_business is anything except OPNRCH and OPNWLD
D2>DESC TMP_CORD_RATES
Name Null? Type
RATE_ID VARCHAR2(5)
RATE NUMBER(13,4)
RATE_PROCESS_FLAG VARCHAR2(1)

Answer 1

Hi folks,
I will explain again.
I have a table
D2>DESC CORD_LOB_MAPPING
Name Null? Type
LINE_OF_BUSINESS NOT NULL VARCHAR2(10)
LOB_DESCRIPTION VARCHAR2(100)
LOB_SID NOT NULL VARCHAR2(10)
I have a column in cord_lob_mapping as line_of_business.
Now i want to delete rows from all the following 3 tables whose rows do not match up with line_of_business of cord_lob_mapping.
D2>DESC tmp_cord_rates
Name Null? Type
RATE_ID VARCHAR2(5)
RATE NUMBER(13,4)
RATE_PROCESS_FLAG VARCHAR2(1)
D2>DESC tmp_cord_rate_ids
Name Null? Type
OUC_CODE VARCHAR2(9)
RATE_ID VARCHAR2(5)
RATEID_PROCESS_FLAG VARCHAR2(1)
D2>DESC tmp_cord_oucs
Name Null? Type
OUC_CODE VARCHAR2(9)
LATEST_PERIOD NUMBER(10)
OUC_PROCESS_FLAG VARCHAR2(1)
LINE_OF_BUSINESS VARCHAR2(10)
Suppose the cord_lob_mapping table has the following rows in line_of_business
column
Line_of_business
world
universe
Now all rows from tmp_cord_oucs whose line_of_business is not world or universe should be deleted.
Simillarly, all corrosponding rates from tmp_cord_rates and rate_ids from tmp_cord_rate_ids should also be deleted whose line_of_business is not world or universe.
I have included the delete statements for each of the 3 tables. Could anyone of you please verify them to be correct.
delete from tmp_cord_rates tcr
where not exists(select 1
     from cord_lob_mapping clm, tmp_cord_oucs tco, tmp_cord_rate_ids tcri     where clm.line_of_business=tco.lob_mapping
     and tco.ouc_code=tcri.ouc_code
     and tcri.rate_id=tcr.rate_id);
delete from tmp_cord_rate_ids tcri
where not exists(select 1
     from cord_lob_mapping clm, tmp_cord_oucs tco
     where clm.line_of_business=tco.lob_mapping
     and tco.ouc_code=tcri.ouc_code);
delete from tmp_cord_oucs tco
where not exists(select 1
     from cord_lob_mapping clm
     where clm.line_of_business=tco.lob_mapping);